Motor drive cover for protection against contaminants

• US 10,447,107 B2
• Filed: 06/12/2014
• Issued: 10/15/2019
• Est. Priority Date: 08/01/2013
• Status: Active Grant

• Current Assignee: Danfoss Power Electronics A/S (Danfoss A/S)
• Original Assignee: Danfoss Power Electronics A/S (Danfoss A/S)
• Inventors: Miller, George, Drabek, Ryan, Grzesik, Lester, Gray, Matthew, Johansen, Frank-Erik, Stoutenborough, Eric Von
• Primary Examiner(s): Gonzalez, Julio C.
• Assistant Examiner(s): Johnson, Rashad H
• Application Number:
  US14/907,912
• Publication Number:
  US 20160172926A1
• Time in Patent Office: 1,951 Days
• Field of Search: 310 58, 310 89, 310 52, 310 54, 310 64, 361695
• CPC Class Codes: H02K 2205/09 Machines characterised by drain passages or by venting, breathing or pressure compensating means
• CPC Class Codes: H02K 5/10 with arrangements for protection from ingress, e.g. water or fingers
• CPC Class Codes: H02K 5/207 with openings in the casing specially adapted for ambient air
• CPC Class Codes: H02K 9/02 by ambient air flowing through the machine

Abstract

A cover for a motor drive is provided. The cover includes an opening (often at the bottom of the cover) to allow air to pass to an air inlet of the motor drive and an opening (often near the top of the cover) to allow air from an air outlet of the motor drive to exit the cover. A hood provides rain protection for the drive and a separator (such as a baffle) within the enclosure prevents air flowing within the enclosure from the air outlet to the air inlet of the drive. The hood and/or the separator are shaped to direct air from the air outlet away from the enclosure in order to substantially reduce the re-circulation of air from the air outlet to the air inlet of the drive.

Claims

1. A cover for a motor drive, wherein the drive includes an air inlet and an air outlet, the cover comprising:

a first opening, wherein, in use, air is allowed to pass through the first opening to the air inlet;

a second opening, wherein, in use, air is allowed to pass from the air outlet through second opening; and

a separator inside the cover that is dimensioned and positioned such that, in use, air is prevented from flowing inside the cover from the air outlet to the air inlet;

wherein the cover and the motor drive define a first space and a second space, the first space being fluidly connected with the air inlet and the second space being fluidly connected with the air outlet; and

wherein a first surface of the separator abuts the first space and a second surface of the separator abuts the second space,

wherein, when in use, air flows from the first space to the motor drive and then to the second space.

2. The cover as claimed in claim 1, wherein the separator is shaped to direct at least some air from the air outlet away from the cover.

3. The cover as claimed in claim 2, wherein the second opening is provided on the front of the cover and, in use, extends parallel to the air outlet.

4. The cover as claimed in claim 2, further comprising a rain restrictor that restricts the ingress of rain into the cover.

5. The cover as claimed in claim 1, wherein the second opening is provided on the front of the cover and, in use, extends parallel to the air outlet.

6. The cover as claimed in claim 5, wherein the separator extends upwards from the second opening to the exterior of the drive.

7. The cover as claimed in claim 6, further comprising a rain restrictor that restricts the ingress of rain into the cover.

8. The cover as claimed in claim 5, further comprising a rain restrictor that restricts the ingress of rain into the cover.

9. The cover as claimed in claim 1, further comprising a rain restrictor that restricts the ingress of rain into the cover.

10. The cover as claimed in claim 9, wherein said rain restrictor is a hood provided on the exterior of the cover.

11. The cover as claimed in claim 10, wherein the hood is shaped to direct at least some air from the air outlet away from the cover.

12. The cover as claimed in claim 11, wherein the hood is shaped by providing a projection towards the bottom of the hood that extends, at an angle, away from the plane of the cover.

13. The cover as claimed in claim 11, wherein the hood is shaped by providing a notch towards the bottom of the hood.

14. The cover as claimed in claim 9, wherein said rain restrictor is a louvered opening.

15. The cover as claimed in claim 9, wherein said rain restrictor is provided to restrict the ingress of rain into the cover through the second opening.

16. The cover as claimed in claim 9, wherein the rain restrictor is shaped to direct at least some air from the air outlet away from the cover.

17. The cover as claimed in claim 1, wherein the cover only covers a portion of the drive.

18. The cover as claimed in claim 17, wherein the rear of the drive is uncovered.

19. A motor drive comprising an air inlet and an air outlet, the motor drive further comprising a cover as claimed in claim 1.